I recently purchased a Streamlight laser/light combo and installed it on my SIG Model 226. You can have it in a laser only; light only or laser and light mode. It also has a strobe feature. The only drawbacks I see so far is that it adds weight and bulk to the pistol and makes the gun holster unfriendly-not factors if the pistol is used for nightstand duties as my pistol is but certainly might well be negative factors in the intended "carry gun" role you are considering.
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